| Gunzberg's reagent | Phloroglucin and vanillin used as a reagent in Gunzberg's test. (05 Mar 2000) |
|---|---|
| Meyer's reagent | A solution of phenolphthalein 0.032, in decinormal sodium hydroxide 21, with water (distilled from glass) sufficient to make 100; in the presence of minute traces of blood, the solution becomes purple or blue-red. (05 Mar 2000) |
| Rosenthaler-Turk reagent | A solution of potassium arsenate in sulfuric acid used in obtaining colour tests for various opium alkaloids. (05 Mar 2000) |
| Millon's reagent | Mercuric nitrate and nitric acid as used in the Millon reaction. (05 Mar 2000) |
| Cleland's reagent | <chemical> A reagent commonly used in biochemical studies as a protective agent to prevent the oxidation of sh (thiol) groups and for reducing disulphides to dithiols. Pharmacological action: sulfhydryl reagents, expectorants. Chemical name: 2,3-Butanediol, 1,4-dimercapto-, (R*,R*)- (12 Dec 1998) |
| Wurster's reagent | Filter paper impregnated with tetramethyl-p-phenylenediamine, which turns blue in the presence of ozone or hydrogen peroxide. (05 Mar 2000) |
| cross-linking reagent | <chemistry> Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other. (12 Dec 1998) |
| Hahn's oxine reagent | An alcoholic solution of 8-hydroxyquinoline used in the determination of zinc, aluminum, magnesium, etc. (05 Mar 2000) |
| Hammarsten's reagent | A mixture of 1 part 25% solution of nitric acid and 19 parts 25% solution of hydrochloric acid; the addition of a few drops to a mixture of 1 part of this reagent and 4 parts alcohol will give a green colour if bile is present. (05 Mar 2000) |
| Sanger's reagent | A reagent used to combine with the free NH2 group of the NH2-terminal amino acid residue in a peptide, thus marking this residue; the combined forms are known as DNP-proteins, Dnp-aminoacyl, etc., the fluorine having been replaced to leave a dinitrophenyl residue (DNP, Dnp, or N2Ph-) attached to the NH2 group. Synonym: Sanger's reagent. Acronym: FDNB (05 Mar 2000) |
| Schaer's reagent | An alcoholic or aqueous solution of chloral hydrate used as an extraction medium in investigations of alkaloids. (05 Mar 2000) |
| Scheibler's reagent | A solution of sodium tungstate in phosphoric acid used in tests for alkaloids. (05 Mar 2000) |
| Schiff's reagent | An aqueous solution of basic fuchsin or pararosaniline which is decolorised by sulfur dioxide, commonly prepared by addition of hydrochloric acid to a dye solution containing a metabisulphite or bisulphite salt; used for aldehydes and in histochemistry to detect polysaccharides, DNA, and proteins. See: Feulgen stain, periodic acid-Schiff stain, ninhydrin-Schiff stain for proteins. (05 Mar 2000) |
| Scott-Wilson reagent | An alkaline solution of mercuric cyanide and silver nitrate used in the detection of acetone. (05 Mar 2000) |
| Nessler's reagent | A solution of potassium hydroxide, mercuric iodide, and potassium iodide; it yields a yellow colour with ammonia (a brown precipitate with larger amounts) that can be used for quantitative assay. (05 Mar 2000) |